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Symmetry-breaking normal state response and surface superconductivity in topological semimetal YPtBi
Hyunsoo Kim, Tristin Metz, Halyna Hodovanets +4
Most of the half-Heusler RPtBi compounds (R=rare earth) host various surface states due to spin-orbit coupling driven topological band structure. While recent ARPES measurements ub…
Campbell penetration depth in low carrier density superconductor YPtBi
Hyunsoo Kim, Makariy A. Tanatar, Halyna Hodovanets +3
Magnetic penetration depth, , was measured as a function of temperature and magnetic field in single crystals of low carrier density superconductor YPtBi by using a tunnel-d…
Frustrated magnetism in tetragonal CoSe, analogue to superconducting FeSe
Brandon Wilfong, Xiuquan Zhou, Hector Vivanco +5
Recently synthesized metastable tetragonal CoSe, isostructural to the FeSe superconductor, offers a new avenue for investigating systems in close proximity to the iron-based superc…
Superconductivity and Charge Density Wave in ZrTeSe
Xiangde Zhu, Wei Ning, Lijun Li +12
Charge density wave (CDW), the periodic modulation of the electronic charge density, will open a gap on the Fermi surface that commonly leads to decreased or vanishing conductivity…
CaIrSn: A weakly correlated nodeless superconductor
Kefeng Wang, C. Petrovic
We report detailed Seebeck coefficient, Hall resistivity as well as specific heat measurement on CaIrSn single crystals. The Seebeck coefficient exhibits a peak corr…
Insulating and metallic spin glass in KFeNiSe (0.06 1.44) single crystals
Hyejin Ryu, Milinda Abeykoon, Kefeng Wang +6
We report electron doping effects by Ni in KFeNiSe (0.06 1.44) single crystal alloys. A rich ground state phase diagram is observed. S…
Sustained phase separation and spin glass in Co-doped KFeSe single crystals
Hyejin Ryu, Kefeng Wang, M. Opacic +5
We present Co substitution effects in KFeCoSe (0.06 1.73) single crystal alloys. By 3.5\% of Co doping superconductivity is suppressed…
Beyond Triplet: Unconventional Superconductivity in a Spin-3/2 Topological Semimetal
Hyunsoo Kim, Kefeng Wang, Yasuyuki Nakajima +11
In all known fermionic superfluids, Cooper pairs are composed of spin-1/2 quasi-particles that pair to form either spin-singlet or spin-triplet bound states. The "spin" of a Bloch…
Strong enhancement of conventional superconductivity near a quantum critical point of (Ca,Sr)_3Ir_4Sn_13
P. K. Biswas, Z. Guguchia, R. Khasanov +5
Competing electronic states are found in the large majority of unconventional superconductors, including high-Tc cuprates, iron based superconductors and many heavy fermion systems…
Topological PdBi half-Heusler semimetals: a new family of non-centrosymmetric magnetic superconductors
Yasuyuki Nakajima, Rongwei Hu, Kevin Kirshenbaum +9
We report superconductivity and magnetism in a new family of topological semimetals, the ternary half Heusler compounds PdBi ( : rare earth). In this series, tuning of the ra…
Nonmetallic Low-Temperature Normal State of K0.70Fe1.46Se1.85Te0.15
Kefeng Wang, Hyejin Ryu, Erik Kampert +4
The normal-state in-plane resistivity below the zero-field superconducting transition temperature and the upper critical field Hc2 were measured by suppressing superconductiv…
Sn-NMR investigations on superconducting CaIrSn: Evidence for multigap superconductivity
R. Sarkar, F. Brückner, M. Günther +7
We report bulk superconductivity (SC) in CaIrSn by means of Sn nuclear magnetic resonance (NMR) experiments. Two classical signatures of BCS superconductivit…
Superconducting and magnetic properties of Sr3Ir4Sn13
P. K. Biswas, A. Amato, R. Khasanov +6
Magnetization and muon spin relaxation or rotation (muSR) measurements have been performed to study the superconducting and magnetic properties of Sr3Ir4Sn13. From magnetization me…
Superconductivity in Ir1-xRhxTe2 (0<=x<=0.3)
Hechang Lei, Kefeng Wang, Milinda Abeykoon +3
We report superconductivity, physical and structural properties of Ir1-xRhxTe2 (0<=x<=0.3). Superconducting transition with maximum Tc~2.6 K appears when the doping content of Rh x…
New layered fluorosulfide SrFBiS2
Hechang Lei, Kefeng Wang, Milinda Abeykoon +2
We have synthesized a new layered BiS-based compound SrFBiS2. This compound has similar structure to BiS2. It is built up by stacking up SrF layers and NaCl-type BiS2 layers…
Antiferromagnetism in semiconducting KFe0.85Ag1.15Te2 single crystals
Hechang Lei, Emil S. Bozin, Kefeng Wang +1
We have synthesized single crystals of K1.00(3)Fe0.85(2)Ag1.15(2)Te2.0(1). The materials crystallizes in the ThCr2Si2 structure with I4/mmm symmetry and without K and Fe/Ag deficie…
Evolution of correlation strength in KxFe(2-y)Se2 superconductor doped with S
Kefeng Wang, Hechang Lei, C. Petrovic
We report the evolution of thermal transport properties of iron-based superconductor KFeSe with sulfur substitution at Se sites. Sulfur doping suppresses the superc…
Thermoelectric studies of KxFe2-ySe2: weakly correlated superconductor
Kefeng Wang, Hechang Lei, C. Petrovic
We report thermal transport measurement of KxFe2-ySe2 superconducting single crystal. Significant peak anomaly in thermal conductivity is observed at nearly TC/2 indicating a large…
Phase Diagram of KxFe2-ySe2-zSz and the Suppression of its Superconducting State by an Fe2-Se/S Tetrahedron Distortion
Hechang Lei, Milinda Abeykoon, Emil S. Bozin +3
We report structurally tuned superconductivity in KxFe2-ySe2-zSz (0<=z<=2) phase diagram. Superconducting Tc is suppressed as S is incorporated into the lattice, eventually vanishi…